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(No Model.)

H. H. BENEDICT. I

TUBE CLEANER FOB. BOILERS.

No. 308,822. Patented Dec. 2, 1884.

UNIT D STATES PATENT O FICE.

HORAGE H. BENEDICT, OF BUFFALO, NEWV YORK, ASSIGNOR TO OHAUNGEY E. KENDALL, OF SAME PLACE.

TUBE-CLEANER FOR BOILERS.

SPECIFICATION forming part of Letters Patent No. 308,822, dated December 2, 18841 To all whom it may concern.-

Be it known that I, HORACE H. BENEDICT, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Tube-Cleaners for Boilers, of which the following is a specification, reference being had therein to the accompanying drawings.

This improvement relates to boiler flue cleaners that are expanded and contracted by a central screw-rod, and with the scrapers at tached to fiat springs; and my invention consists in two circular conical long nuts or expanders, each working on or near the ends of the screw-rod, their conical peripheries coming in contact with the inner ends of the cleaners or tips, which are formed into a projection for that purpose, setting in grooves on the cones, and the central rod having arighthand thread at one end, and aleft-hand thread at the other, on which the nuts move, so that when the rod is turned one way the cones expand the scrapers, and when turned the other the scrapers are contracted, so as-to fit varioussized flues.

In the drawings, Figure 1 represents a vertical longitudinal section through the center of two springs and their tips, the expanding cones, the center piece, and handle-coupling; Fig. '2, a vertical cross section through an expander.

A A represent two of the flat springs. B is the center piece, to which all the springs are securely fastened. O is the screw-rod running through the middle of the device and through the center piece, B, and held thereto by nuts a a. The outer end of the rod is cut with a left-hand screw-thread and the other end with a right-hand thread. On these are screwed long conical-shaped nuts D D, acting as expanding or contracting devices by their conical surfaces coming in contact with inner Application filed February 27, 1884. (No model.)

projections, 12 b, of the tips F F, so that when the rod is turned the projections b I ride up and down in grooves ff in the outside of these eXpanders, and thus throw out or in the scrapers in connection with the springs A, these grooves preventing the expanders from turning.

I disclaim any invention in the scrapers, the curved flat springs, the center rod, or center piece, D; but I believe the inner projections, 1) b, and the conical expanding nuts D D to be new, also the long incline on these nuts, with the projections 1) working in their grooves, by which the cones act directly on the scrapers instead of on the springs, as is usual, thereby getting a more direct action, the expansion and contraction of the cleaner depending on the incline of the cone-nuts instead of on the curve of the springs. By my device the springs A need not necessarily be curved.

The projections b or their equivalentscan be put on the springs instead of the scrapers; but I prefer them as shown and claimed.

I clain1 1. In boiler-flue cleaners, the combination of the springs A A, having scraper-tips F, with the projections b b thereon, and the conical nuts D D on screw-rod O, by which the scrapers are directly expanded or contracted, substantially as specified.

2. In a boiler-flue cleaner, the inclined conic'al expanders D D, with grooves f f, adapted to receive projections on the shanks of the scraper thereon, working on the central rod,

0, substantially as and for the purpose specifled.

In testimony whereof I afiix my signature in '80 presence of two witnesses.

HORACE H. BENEDICT.

Witnesses:

J. R. DRAKE, T. H. Pilnsons. 

